10 repairs, Repairs – FRITSCH PULVERISETTE 4 classic line User Manual
Page 47
10
Repairs
DANGER!
Mains voltage!
– Before beginning with repair work, unplug the mains
plug and protect the device against being unintention-
ally switched back on.
– Indicate repair work with warning signs.
– Repair work may only be performed by specialised per-
sonnel.
– Put safety equipment back into operation after mainte-
nance work.
Fault description
Cause
Remedy
The ready status indicator
doesn't light up
No mains connection
Plug in mains plug
Main switch (8)
Switch on main switch
START button is pressed but mill
does not start up
Check if POWER SUPPLY is lit
see above
Pause time active
Wait for end of pause or press "STOP"
Safety lock was opened manually see Ä Chapter 2.6.1 ‘Opening the hood
without mains connection’ on page 14
Mill reduces speed automati-
cally
if display is blinking: Overload
Reduce load or accept automatically set rota-
tional speed
Mill stops running
Switched off due to thermal
overload of the drive
Allow device to cool down and select a lower
speed
Imbalance of machine too high
Improve mass balance, see Ä Chapter 6.6
Drive was blocked
Rectify malfunction in grinding chamber
Toothed belt of motor loose or
broken
Check toothed belt, replace if necessary
The hood cannot be opened
No mains connection
Plug in mains plug
Main switch (8)
Switch on main switch
Grinding stock escapes
Clamping device loose
clamp again
Seal ring is soiled or defective
Clean or replace seal ring
Runs unevenly with strong
vibrations
Bowls are imbalanced
Arrange the bowls symmetrically (equal
masses in the opposite positions)
Error code 5 blinks in the display Emergency off switch (5) pressed Unlatch the emergency off switch
Error code 6
Invalid program data
Rotational speed or grinding duration must not
be set to zero.
Repairs
- 47 -